If you activate a toggled menubar (Settings->Preferences->Menu Bar->check box "Hide (use Alt or F-10 key to toggle"), then close the Preferences window, you will not have a menubar. There are two known options to regain the menubar. (Bug 21918)

Yes. This is bad. In Gnome3 a window entitled "Reload" pops then by A.P.I., I assume, disables the ability for one to close either the main window nor the Reload window. It also eats my cursor and forces me to use keyboard's shortcuts instead.